Owner's Manual for the vehicle. With a quick reference ... - E38.org

132nTire inflation pressure
Tire condition
Information for your safety
The factory-approved radial tires are
matched to the car and have been selected
to provide optimum safety and
driving comfort on your car.
It is not merely the tire's service life, but
also driving comfort and - above all else
- driving safety which depend on the
condition of the tires and the maintenance
of the specified tire pressure.
Incorrect inflation pressure is a frequent
cause of tire damage. They also influence
the roadholding ability of your
BMW.
Check tire inflation pressures – including
the spare tire – regularly,
at least every two weeks and before beginning
a longer trip. If this is not done,
incorrect tire pressures can cause driving
instability and tire damage, ultimately
resulting in accidents.<
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Tire tread – tire damage
Inspect your tires frequently for tread
wear, signs of damage and for foreign
objects lodged in the tread. Check the
tread depth.
Tread depth should not be allowed to
go below 0.12 in (3 mm), even though
the legally specified minimum tread
depth is only 0.063 in (1.6 mm). Wear
indicators appear in the tread at 0.063 in
(1.6 mm) to indicate that the legally permissible
wear limit has been reached.
Below 0.12 in (3 mm) tread depth, there
is an increased risk of aquaplaning,
even at relatively moderate speeds and
with only small amounts of water on the
road.
Do not drive on a deflated (flat)
tire. A flat tire greatly impairs
steering and braking response, and can
lead to complete loss of control over
the vehicle.
Avoid overloading the vehicle so that
the permitted load on the tires is not exceeded.
Overloading can lead to overheating
and increases the rate at which
damage develops inside the tires.
The ultimate result can assume the form
of a sudden air loss.
Unusual vibrations encountered during
normal vehicle operation can indicate
tire failure or some other vehicle defect,
as can variations in normal vehicle response,
such as a pronounced tendency
to pull to the left or right. Should
this occur, respond by immediately reducing
your speed and carefully proceeding
to the nearest BMW center or
professional tire center, or having the
vehicle towed in to have it and its tires
inspected.
Tire damage (up to and including blowouts)
can endanger the lives of both the
vehicle occupants and other road
users.